MarinePure is the perfect place for beneficial bacteria to flourish in order to remove harmful fish wastes. It will eliminate ammonia and nitrites and lower nitrates. MarinePure’s bio-media is the most technically advanced bio-media available today. Why Use MarinePure Better value due to high performance Reduced tank maintenance Allows for higher fish loads Can use a smaller filtration footprint More consistent water chemistry Easy to shape 8x8x1″ Plates Designed for Ammonia and Nitrite Removal Perfect for the creative hobbyist. Use in sumps, under gravel, shape to fit in tight/custom places.